[QUOTE=balto charlie;10055948]Schwalbe has a decent one as well, less tread more studs. The tread is good for snow but kinda worthless on ice.

I just received my new set of Schwalbe Marathon Winters earlier this week in the mail. Haven't ridden them yet obviously, but they are packed with studs compared to the W106s. In my experience, the tread type makes almost no difference on glare ice. Ice performance is dictated by the size, type and frequency of the studs. Without studs, you're going down on ice. My experience comes from motorcycle ice racing, agreed different than bicycle commuting but still similar. Deeper tread works for you when the ice is covered with loose ice shavings or snow. Since my commute to work uses about 4 miles of rail trail (never gets plowed), I went for the tire with studs farther up the side wall than the W106 to deal with the inevitable snow ruts that will form. Peter White has done a pretty good job of listing the pros and cons of each tire type. Has a sense of humor too. I think I would like this guy.
Andy